Construction of stuffing boxes for revolving shafts of all kinds and especially of turbine shafts and the like



S OF ALL LIKE 'J. LEWQY CONSTRUCTION OF STUFFING BOXES FOR REVOLVINGSHAFT KINDS AND ESPECIALLY OF TURBINE SHAFTS AND 1' Filed NOV. 28. 1921KWa Patented July T, 422 4.

.J'ULES LEROY, or LA GABENNE COLOEDIIBES, snmn, summon CONSTRUCTION OFSTUFFING BOXES FOR REVOLVING SHAF'IS OF ALL KINDS AND ESPECIALLY FTURBINE SHAFTS-AND THE LIKE. 7

Application filed November 28, 1921.

To all whom it may concern:

Be it known that 1, Jones LEROY, engineer, citizen of the Republic ofFrance, residing at 48 Rue de Plaisance, La Garenne u Colombes, Seine,have invented an Im- "proved Construction of Stuffing Boxes forRevolving Shafts of all Kinds and Especially of Turbine Shafts and thelike, of which the following is a specification.

This invention relates to an'improved construction of stuffing boxes forrevolving shafts of all kinds, and especially for turbine shafts and thelike. The stuffing box comprises means which secures steam-tightllo nesswithoutwearing the shaft which passes through it, by reason of arrangingthe entire apparatus which secures this steamtightness, for turning withthe revolving shaft, as hereinafter set forth.

Referring to the accompanying drawings,

Figure 1 shows a longitudinal section of the device on the central axisof the box.

Figure 2 shows two half sections on the lines II-II and II-Hrespectively, of as Figurel.

Figure 2 shows a plan view from above of one of the elements of the bornhaving the spring, to which reference will -be made hereinafter, shownas out.

Figure 3 shows a diagrammatic section of a stufiing box having twoelements.

Figure 4 shows a longitudinal section of a lubricating device.

Figure 5 shows a front view on line V-V of the device illustrated inFigure 4.

These drawings show the apparatus as composed of a metal casing I,closed at each end by screw cap 2 and plug 3, through which freelypasses the shaft 11 which may be for instance, a turbine shaft, andaround which is supported in any convenient manner, the casing Ireplacing a stuffing box of the ordinary kind.

In the interior of the casing I are placed two complete stuffing boxes4, 4, which are slidable on shaft IT and which serve to hold the packingwashers 5, 5', clamped by the caps 7, 7, forming together a stufiing boxand devised to ensure steam-tightness around the shaft passing throughthe apparatus.

The caps 7, 7 are preferably screwthreaded, the one with a right-handedthread the other with a left-handed thread, so as to tend to grip oneanother, under the strain of Serial No. 518,391.

the turn communicated to them by the rotation of shaft 11. Theouterfaces 6, 6, of

these boxes, and the inner faces 2, 3, of the cap 2 and plug 3 whichare, respectively, in contact, are suitably adjusted :to ensure perfectcontact therebetween. Lubricating apertures 19 and 20 serve tolubricatethese nected to the boxes 4,4, by means of mortices and tenons21, 21, and 22, 22 (Fig. 2). Under the influence of a helical spring 12the two pieces are separated without losing connection, and thus ensureclose contact of the boxes 4, 4, with the screw cap 2, and plug 3.

The shaft 11, in its rotation thus causes rotation of the entireconstruction, except the casing T and the screw cap 2, and plug 3, whichremain stationary.

1 The casing I can be filled with oil through an aperture 13 and can bedrained through aperture 14. A drop lubricator or other suitable meanscan be provided at 13, or a constant circulation of oil can bemaintained within the casing.

Apertures 16, in the vertical wall of casing 1 serve for attaching thecasing by means of screws or rivets, to a turbine or other apparatushaving a rotating shaft, and re cesses 15 formed in the screw plug 3,permit readily securing the plug in place.

In the principal form of invention above described, and shown in Figs.1, 2 and 2, there is but a single compartment. Evidently, however, theinvention is adapted to cover that form of device, wherein severalcomplete units are placed adjacent each other, and separated merely by apartition. This form has been represented schematically, in Fig. 3,wherein, a packing box has two identical elements, 1 and 1 separated bya loose partition 34.

One stuffing box may thus be composed of one or more elements up to anydesired number.

Figures 4 and 5 show a lubricating device my a .the apertures 37; a I

In'v'Figure 5, the discs 39 and 40 are shown close together and fixed bymeans of screws, one of them to the box 4, and the other to the screwplug 3. This arrangement can, howeven-be made in any other convenientmanner for the purpose of enabling the easy replacement of these parts.The discs may be formed of various materials according to tliejuse towhich the stuffing box is to be -apied.

The apparatus constructed as above described operates in the followingmanner:

, When the turbine or other apparatus of like kind, on' which thestuffing box above described, is mounted, is in motion, the shaft 11revolves, and by reason of the key 10, the

parts 8 and 9, andthe projections and'reasses-21,21, 22, 29/,- itcarries with it the stuffing boxes 4, and 4 firmly pressed againstthe-screw cap 2, and plug 3, by the actionof the spring 12. By thismeans, steam-tightness is realized, first,'between the shaft 11 and theboxes 4,4, by means of washers 5, 5, which permit of a longitudinalmotion of the shaft, and second, between the movable surfaces 6, 6 andthe fixed parts, 2, 3 by reason of the close contact therebetween, whilepermitting the shaft 11 to move to some extent both laterally andvertically.

In Fig. 1, the contact surfaces 2 and 3, between the boxes 4 and 4C andthe ends of the casing, have been represented wholly schematically. Incertain cases, and particularly where pressures are very high, it isadvantageous to form surfaces having more perfect lubrication.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be per formed, I declarethat what I claim is:

A stufling means for rotatable shafts, comprising, in combination, acasing, bearing surfaces on the casing, two complete stufiing boxes inthe casing, the stufling boxes ends having a bearing surface on one sidecooperating with the casing bearing surfaces, and each having a recesson the opposite side, an annular member having two parts, a coil springseparating the two parts, the two parts being interposed between thestuffing boxes, said two parts having interengaging portions to restrainthe parts to rotate together, one of said two parts being keyed to therotatable shaft with which used, and a projection on each of the twoparts, fitting into a recess in each of the stufling boxes.

In testimony whereof, I have signed my name to this specification inpresence of two witnesses.

J ULES LEROY. Witnesses:

PIERRE LOYST, J ULES FAYoLLET.

